ByteDance interview questions

Had interview at Bytedance Singapore. Interviewer is so inexperienced and rude. He did not introduce himself, and keep asking business proposal for free. When I requested additional information, he just said he wanted to know my ideas. He did not understand my scope and experience, I felt like I was giving training to a newcomer instead of attending an interview. He was transferred from China to SG office recently. Suspect that they already have someone on mind to fit into the role, just run through the process to show that they cannot find candidate here. HR is also inexperienced, he did not turn on the camera during interview and sent out the interview link without putting the title of the interviewer.